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Purpose of maintaining conductivity of primary water in a generator is

1. To avoid earth fault caused by excess conductivity.

2. To avoid corroision of primary water system (including stator windings) as water gets acidic with low conductivity(due to ion exchanger used for reduction of conductivity).

P.S. conductivity of PW for a 500 MW generator is usually maintained b/w 1 to 2 micro S/cm.

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